乳腺癌是女性最常见的恶性肿瘤之一,据统计,全球每年乳腺癌的发病人数约有120万人,约50万人死于乳腺癌。在西欧、北美等发达国家,乳腺癌的发病率占女性恶性肿瘤的首位,近年来我国许多大城市(如上海、北京、天津等地区)乳腺癌的发病率呈不断上升趋势。乳腺癌已严重威胁着女性的健康和生命安全。 Breast cancer is one of the most common malignant tumors in women. According to statistics, the number of breast cancer in the world is about 1.2 million annually and about 500,000 people died of breast cancer. In developed countries such as Western Europe and North America, the incidence of breast cancer accounts for the top of female malignant tumors. In recent years, the incidence of breast cancer has been on the rise in many big cities in China (such as Shanghai, Beijing and Tianjin). Breast cancer has seriously threatened the health and safety of women.